Type-writer attachment.



F. A. CRITZ, JR.. TYPE WRITER ATTACHMENT. APILIOATION FILED APR. 27, 1912.

1 Patented May 5, 1914.

FRANK A. CRITZ, JR, OF- WEST POINT, MISSISSIPPI.

TYPE-WRITER ATTACHMENT.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed April 27, 1912. Serial No. 683,640.

' tain amountof vertical play in combination with a horizontal movement for the purpose of changing tromsmall to capital let'- ters, or where the key basket is shifted to the samepurpose.

The object of the invention is to obtain a noiseless shift upon pressure of the shift key without regard to the rapidity or nature of the shifting movement. It will also i be understood that this principle can be applied to other movable parts of a typewriter where such part is at present stopped or limited in its movement by striking against a fixed abutment, which is usuallyln the form of an adjustable screw.

. position for writing small letters.

In the acemnpanying drawings, I have illustrated the invention as applied to the platen. and in said drawings, Figure l is an end view of a Royal typewriter with my attachment applied thereto. and'thc parts in Fig. 2 is a similan view, the platen being shifted into position for writing capital letters. Fig. 23 is a perspective view illustrating a 'n'ei'errcd form of securing one of the supporting chains.

in these drawings, 1 represents the frame of the machine, 2 the bearings for the platen, :5 the platen and t one of the pivoted arms supporting the platen frame. These parts are all found upon the Royal typewritcas now in use. This cimstruction I have changed by forming the supporting arms l with an eye 4 at its free end secured to the upper portion of the frame 1 and to the rear of the platen is an angled bracket 5 through the outwardly extending portion of which passes a small eye bolt (3 locked in position by suitable nuts 7. To the eye of said bolt is secured one end of a chain 8, the other end of which engages the eye 4 and the eye bolt (3 is so adjusted that the chain 8 will be stretched taut and support the arm 4 when -ihe frame 2 and platen 3 are in normal position.

To the frame 1 and below the platen 3 I attach one end of a chain 9, the other end of which also engages the eye 4? and this 'ehain is normally slack as shown in Fig. 1.

The chain 9 is connected at its lower end-to a bolt 9 arried by a bracket 9 thus making its length adjustable. But when the parts are shifted to the position as shown in Fig. 2 for the purpose of changing from small to apital letters the chain 9 is stretched taut and limits upward movement of the arm 4, stopping it at the proper, time,

and without the noise which would be caused by said arm striking an abutment. \Vhen' the parts are returned to normal position the downward movement of the arm 4 is checked by the chain 8 at the proper point and also without noise which would be caused by the said arm striking a second abutment. I therefore provide means for limiting the shifting movement in both directions without causing any of the shifting parts to strike against any fixed portion of the machine. I

It will be obvious that this attachment can be applied to various forms of typewriters by simply changing the points 'of connection of the chains according .to the arrangement of the movable parts of the typewriter, and I do not desire to be limited to its use with any particular make of type writer, or to one in which the platen only been limited in its movement bythe sameeomiug in contact with a fixed abutment,

by a flexible cord chain or any other flexible material, said limiting or stopping of said movable part being brought about by one end of said flexible material being attached to said movable part and the other end being attached to some fixed part or stationary part of the typewriter, the point of attachment to said movable part, before said movable part is moved, being situated with reference to the said stationary point to which one end of said flexible material is attached, so that the ends of said flexible material will not be so extended as to pull said flexible material taut and said flexible material is so arranged that the length there-Of can be 50 LlSiGLl as to limit said movable part in its proper movementl'rom said fixed point, by said flexible material being drawn taut be tween suill fixed point and said iiievzilwle part, thus iriiusin il'ie stopping (if said movable part to be noiseless. H a chain is used. as said flexible maierial, it should lie so made that the encls of each link thereof slieuld be in constant contact with the ends {If the links innnediately connected to such link.

1W hat I claim is:

1. The cembinuliien Willi a typewriter having :1 shifting device for the purpose of changing from 51112111 to capital letters, of a flexible device fixed at one eml to the typewriter frame and secured at elm eppesite eml in said shilling (luVllfG and nei'limlly supporting the smile in position for wailing small letters, and a second flexible device secured to the fi-zune and also l0 said. shilling ileviee mail llui'llllllly slack, the second men liened ileziible device being dmwn taut when the parts shift into position for writing capital. letters.

3. in a typewriter liming :1 vertically movable platen 1i pivoted arm adapted t0 impart such nimeinenh a elmin nee encl pee lieu of which is mljnstably secured to 11 p01- tien of the typewriter limiiie and the other end of which is secured to the free end 01 said arm, and a second chain having one end j)()l-l 1l also seemed to the free end of said arm and. the opposite end portion edjustzibly secured to the frame of the typewriter at a point below the arm, the first mentioned chain supporting the arm in its normal peeition and the second mentioned clmin limiting vertical movement of the arm FRANK A. Gill Z J12.

l Vitnesses f JULIA HQWARD, FRANK A. Clil'lk 

